New from Arc Building Products. Backer Rod is a closed cell, waterproof and weatherproof polyurethane foam rod designed to control sealant depth. Available in sizes from 6mm to 50mm, it is inserted into a joint/expansion joint to control sealant depth to create a backstop to resist gasoline, oil and most other solvents. A soft and flexible material rod to fill in cracks and gaps. It can be applied in glass installations, expansion joints, door and window seams, pavement joints and craft projects.
